[PATCH 00/18] cpuidle: code consolidation

[daniel.lezcano@linaro.org (Daniel Lezcano)]

On 04/10/2013 09:12 PM, Rafael J. Wysocki wrote:
> On Wednesday, April 10, 2013 04:22:05 PM Daniel Lezcano wrote:
>> This patchset series provide some code consolidation across the different
>> cpuidle drivers. It contains two parts, the first one is the removal of
>> the time keeping flag and the second one, is a common initialization routine.
>>
>> All the drivers use the en_core_tk_irqen flag, which means it is not necessary
>> to make the time computation optional. We can remove this flag and assume the
>> cpuidle framework always manage this operation.
>>
>> The cpuidle code initialization is duplicated across the different drivers in
>> the same manner.
>>
>> The repeating pattern is:
>>
>> SMP:
>>
>> cpuidle_register_driver(drv);
>> for_each_possible_cpu(cpu) {
>> 	dev = per_cpu(cpuidle_device, cpu);
>> 	cpuidle_register_device(dev);
>> }
>>
>> UP:
>>
>> cpuidle_register_driver(drv);
>> cpuidle_register_device(dev);
>>
>> As on a UP machine the macro 'for_each_cpu' is a one iteration loop, using the
>> initialization loop from SMP to UP works.
>>
>> The patchset does some cleanup for different drivers in order to make the init
>> code the same. Then it introduces a generic function:
>>
>>   cpuidle_register(struct cpuidle_driver *drv, struct cpumask *cpumask)
>>
>> The cpumask is for the coupled idle states.
>>
>> The drivers are then modified to take into account this new function and
>> to remove the duplicated code.
>>
>> The benefit is observable in the diffstat: 332 lines of code removed.
>>
>> Tested-on: u8500
>> Tested-on: at91
>> Tested-on: intel i5
>> Tested-on: OMAP4
>>
>> Compiled with and without CPU_IDLE for:
>>  u8500, at91, davinci, exynos, imx5, imx6, kirkwood, multi_v7 (for calxeda),
>>  omap2plus, s3c64, tegra1, tegra2, tegra3
>>
>>
>> Daniel Lezcano (18):
>>   ARM: OMAP3: remove cpuidle_wrap_enter
>>   cpuidle: remove en_core_tk_irqen flag
>>   ARM: ux500: cpuidle: replace for_each_online_cpu by
>>     for_each_possible_cpu
>>   ARM: imx: cpuidle: create separate drivers for imx5/imx6
>>   cpuidle: make a single register function for all
>>   ARM: ux500: cpuidle: use init/exit common routine
>>   ARM: at91: cpuidle: use init/exit common routine
>>   ARM: OMAP3: cpuidle: use init/exit common routine
>>   ARM: s3c64xx: cpuidle: use init/exit common routine
>>   ARM: tegra1: cpuidle: use init/exit common routine
>>   ARM: shmobile: cpuidle: use init/exit common routine
>>   ARM: OMAP4: cpuidle: use init/exit common routine
>>   ARM: tegra2: cpuidle: use init/exit common routine
>>   ARM: tegra3: cpuidle: use init/exit common routine
>>   ARM: calxeda: cpuidle: use init/exit common routine
>>   ARM: kirkwood: cpuidle: use init/exit common routine
>>   ARM: davinci: cpuidle: use init/exit common routine
>>   ARM: imx: cpuidle: use init/exit common routine
>>
>>  arch/arm/mach-at91/cpuidle.c                    |   18 +--
>>  arch/arm/mach-davinci/cpuidle.c                 |   21 +---
>>  arch/arm/mach-exynos/cpuidle.c                  |    1 -
>>  arch/arm/mach-imx/Makefile                      |    1 +
>>  arch/arm/mach-imx/cpuidle-imx5.c                |   40 +++++++
>>  arch/arm/mach-imx/cpuidle-imx6q.c               |    3 +-
>>  arch/arm/mach-imx/cpuidle.c                     |   80 -------------
>>  arch/arm/mach-imx/cpuidle.h                     |   10 +-
>>  arch/arm/mach-imx/pm-imx5.c                     |   30 +----
>>  arch/arm/mach-omap2/cpuidle34xx.c               |   49 ++------
>>  arch/arm/mach-omap2/cpuidle44xx.c               |   23 +---
>>  arch/arm/mach-s3c64xx/cpuidle.c                 |   15 +--
>>  arch/arm/mach-shmobile/cpuidle.c                |   11 +-
>>  arch/arm/mach-shmobile/pm-sh7372.c              |    1 -
>>  arch/arm/mach-tegra/cpuidle-tegra114.c          |   27 +----
>>  arch/arm/mach-tegra/cpuidle-tegra20.c           |   34 +-----
>>  arch/arm/mach-tegra/cpuidle-tegra30.c           |   28 +----
>>  arch/arm/mach-ux500/cpuidle.c                   |   33 +-----
>>  arch/powerpc/platforms/pseries/processor_idle.c |    1 -
>>  arch/sh/kernel/cpu/shmobile/cpuidle.c           |    1 -
>>  arch/x86/kernel/apm_32.c                        |    1 -
>>  drivers/acpi/processor_idle.c                   |    1 -
>>  drivers/cpuidle/cpuidle-calxeda.c               |   53 +--------
>>  drivers/cpuidle/cpuidle-kirkwood.c              |   18 +--
>>  drivers/cpuidle/cpuidle.c                       |  137 ++++++++++++++---------
>>  drivers/idle/intel_idle.c                       |    1 -
>>  include/linux/cpuidle.h                         |   20 ++--
>>  27 files changed, 162 insertions(+), 496 deletions(-)
>>  create mode 100644 arch/arm/mach-imx/cpuidle-imx5.c
>>  delete mode 100644 arch/arm/mach-imx/cpuidle.c
> 
> I will be traveling from Saturday onwards pretty much until the beginning of
> the 3.10 merge window, so I'm afraid this will have to wait for the next
> release cycle.  At least I'm not going to take patches that haven't been
> ACKed before tomorrow evening (CEST).

Ok, thanks for the heads-up.

  -- Daniel


-- 
 <http://www.linaro.org/> Linaro.org ? Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog